P.  Pachfule, Panda, T., Dey, C., and Banerjee, R., ?Structural diversity in a series of metal-organic frameworks (MOFs) composed of divalent transition metals, 4,4 `-bipyridine and a flexible carboxylic acid?, Crystengcomm, vol. 12, no. 8, pp. 2381-2389, 2010.